Conversational Search: Add support for grounding

[dtrenz]

A screenshot that you have tested with "Try this API".

Already supported in REST API: https://cloud.google.com/generative-ai-app-builder/docs/answer#return-support-scores

What would you like to see in the library?

I would like to see support added for groundingSpec in answerQuery() request and groundingScore in response.

Describe alternatives you've considered

No response

Additional context/notes

No response

[sofisl]

Hi @dtrenz, thank you for the feature request! Unfortunately this would be better placed in the API tracker itself, since this just means that unfortunately the API hasn't made this feature available in grpc yet. Thank you!